Note 21 - Parent Only Condensed Financial Statements - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest receivable and other assets	$ 18,797	$ 13,026
Total assets	1,094,887	1,034,852
LIABILITIES AND SHAREHOLDERS’ EQUITY
Interest payable and other liabilities	9,354	5,203
Total liabilities	995,849	944,085
Shareholders’ equity
Common stock, no par value; 50,000,000 shares authorized, 8,194,805 and 8,098,605 shares issued and outstanding at December 31, 2018 and 2017, respectively	25,429	24,773
Retained earnings	70,686	61,429
Accumulated other comprehensive (loss) income, net of tax	(435)	989
Total shareholders’ equity	99,038	90,767	$ 82,450
Total liabilities and shareholders' equity	1,094,887	1,034,852
Parent Company [Member]
Cash	281	269
Investment in bank subsidiary	98,678	90,346
Interest receivable and other assets	107	186
Total assets	99,066	90,801
LIABILITIES AND SHAREHOLDERS’ EQUITY
Interest payable and other liabilities	28	34
Total liabilities	28	34
Shareholders’ equity
Common stock, no par value; 50,000,000 shares authorized, 8,194,805 and 8,098,605 shares issued and outstanding at December 31, 2018 and 2017, respectively	25,429	24,773
Additional paid-in capital	3,358	3,576
Retained earnings	70,686	61,429
Accumulated other comprehensive (loss) income, net of tax	(435)	989
Total shareholders’ equity	99,038	90,767
Total liabilities and shareholders' equity	$ 99,066	$ 90,801